DUAL-CONJUGATE ADAPTIVE OPTICS INSTRUMENT FORWIDE-FIELD RETINAL IMAGING

摘要

To date only conventional single-conjugate adaptive optics (SCAO) systems are used tocorrect ocular aberrations. A major shortcoming of SCAO is the severely restrictedcorrected field of view. This can be solved with multi-conjugate adaptive optics(MCAO), a solution that is costly and gives bulky instruments. Another problem,especially in the study of the human eye, is unwanted light from parasitic sourcereflections and light from unwanted object regions. We present a dual-conjugate adaptiveoptics (DCAO) demonstrator that will enable wide field high resolution imaging of thehuman retina in vivo, implementing five retinal guide stars, two OKO micromachinedmembrane deformable minors; a 15 mm 37 channel pupil conjugate mirror, and a 40mm 79 channel mirror conjugated to a plane in the vitreous body approximately 3 mm infront of the retina. The AO system runs with a closed-loop measurement wavelength of835 nm. It incorporates an array of collimator lenses to spatially filter the light from allguide stars using only one adjustable iris, and a single camera to image the Hartmannpatterns of multiple reference sources. Optical simulations in Zemax indicate an increaseof the retinal isoplanatic patch from a radius of 0.5 degrees using SCAO toapproximately 3.5 degrees or more using DCAO. The advantage of this is a clinicallyuseful imaging area that is approximately 50 times the size of an SCAO system. This iscorroborated by measurements on a model eye while performing SCAO, ground layeradaptive optics (GLAO), and DCAO correction..